Probing Active-Sterile Neutrino Transition Magnetic Moments with Photon Emission from CE$\nu$NS

Abstract

In the presence of transition magnetic moments between active and sterile neutrinos, the search for a Primakoff upscattering process at coherent elastic neutrino-nucleus scattering (CE$\nu$NS) experiments can provide stringent constraints on the neutrino magnetic moment. We show that a radiative upscattering process with an emitted photon in the final state can induce a novel coincidence signal at CE$\nu$NS experiments that can also probe neutrino transition magnetic moments beyond existing limits. Furthermore, the differential distributions for such a radiative mode can also potentially be sensitive to the Dirac vs. Majorana nature of the sterile state mediating the process. This can provide valuable insights into the nature and mass generation mechanism of the light active neutrinos.

38 pages, 9 figures; expanded discussion of constraints, matches published version

References in corpus (4)

• Observation of Coherent Elastic Neutrino-Nucleus Scattering
• Double Bangs from New Physics in IceCube
• Low-energy probes of sterile neutrino transition magnetic moments
• General neutrino interactions with sterile neutrinos in light of coherent neutrino-nucleus scattering and meson invisible decays

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